Cast Steel Gate Valve

Cast steel gate valve is a type of gate valve that uses metal steel to cast into castings. It is mainly used as a regulating and stopping device in pipeline systems. The opening and closing part of the cast steel gate valve is the gate, and the direction of movement of the gate is perpendicular to the direction of the fluid. It can only be fully opened and closed, and can not be adjusted and throtched.

The most important feature of the steel gate valve of ZHEJIANG TIANSHENG VALVE CO.,LTD.  is that it can be ensured that the permissible leakage rate can be lower than that specified in API6D and API600, and the middle shaft sealing can pass the USA VOC leakage test. TSV can provide trims of various materials including materials specified by API600. We can also provide valves of various casting materials, such as carbon steel, stainless steel, alloy, Hastelloy, nickel chrome and etc.

Design Objectives

• Primary Function: To provide a tight shut-off for fluid flow in pipelines.

• Operational Requirements: Suitable for high-pressure and high-temperature applications.

• Durability: Long service life with minimal maintenance.

• Compliance: Adherence to international standards such as API, ASME, and ANSI.

Material Selection

The valve body and components are made from cast steel, a material chosen for its excellent mechanical properties, including:

• High Strength: Capable of withstanding high pressures and mechanical stress.

• Temperature Resistance: Suitable for applications involving steam and high-temperature fluids.

• Corrosion Resistance: Performs well in non-corrosive or mildly corrosive environments.

• Common Grades:

  • ASTM A216 WCB: Standard carbon steel for high-temperature service.

  • ASTM A352 LCB/LCC: Low-temperature carbon steel for cryogenic applications.

Valve Design Features

• Body Design: Robust and compact, designed to handle high-pressure conditions.

• Bonnet Connection: Bolted bonnet for easy maintenance and repair.

• Pressure Seal Bonnet: Optional for high-pressure applications.

• Gate Design: Wedge-shaped (solid, flexible, or split wedge) to ensure tight sealing.

• Stem Design: Rising stem or non-rising stem, depending on application requirements.

• Stem Material: Stainless steel (e.g., ASTM A182 F6) for corrosion resistance and durability.

Sealing Mechanism

• Metal-to-Metal Sealing: Ensures leak-tight performance under high pressure.

• Resilient Seats: Optional for applications requiring bubble-tight shut-off.

End Connections

• Flanged Ends: Compliant with ANSI/ASME B16.5 standards.

• Butt-Weld Ends: For high-pressure and high-temperature applications.

• Socket-Weld or Threaded Ends: For smaller sizes and lower-pressure applications.